TPA751

700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

WITH DIFFERENTIAL INPUTS

SLOS336C DECEMBER 2000 REVISED OCTOBER 2002

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

Fully Specified for 3.3-V and 5-V Operation

Wide Power Supply Compatibility
2.5 V 5.5 V

Power Supply Rejection at 217 Hz
84 dB at V

= 5 V

 81 dB at V

= 3.3 V

Output Power for R

= 8

 700 mW at V

= 5 V

 250 mW at V

= 3.3 V

Ultralow Supply Current in Shutdown
Mode . . . 1.5 nA

Thermal and Short-Circuit Protection

Surface-Mount Packaging
SOIC
PowerPAD

MSOP

 MicroStar Junior

(BGA)

description

The TPA751 is a bridge-tied load (BTL) audio power amplifier developed especially for low-voltage applications
where internal speakers are required. Operating with a 3.3-V supply, the TPA751 can deliver 250-mW of
continuous power into a BTL 8-

load at less than 0.6% THD+N throughout voice band frequencies. Although

this device is characterized out to 20 kHz, its operation is optimized for narrower band applications such as
wireless communications. The BTL configuration eliminates the need for external coupling capacitors on the
output in most applications, which is particularly important for small battery-powered equipment. This device
features a shutdown mode for power-sensitive applications with a supply current of 1.5 nA during shutdown.
The TPA751 is available in a 3.0

3.0 mm MicroStar Junior

(BGA), 8-pin SOIC surface-mount package and

a surface-mount PowerPAD

MSOP.

Audio

Input

Bias

Control

VDD

700 mW

VO+

VDD

BYPASS

IN 

VDD/2

SHUTDOWN

VO 8

GND

From System Control

IN+

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2002, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

SHUTDOWN

BYPASS

IN+

GND
V

D OR DGN PACKAGE

(TOP VIEW)

(SIDE VIEW)

MicroStar Junior

(GQS) Package

(TOP VIEW)

SHUTDOWN

BYPASS

IN+
IN

GND
VDD
VO+

NOTE: The shaded terminals are used for thermal

connections to the ground plane.

(E2)
(E3)

(E4)
(E5)

(A2)

(A3)
(A4)
(A5)

PowerPAD and MicroStar Junior are trademarks of Texas Instruments.

TPA751
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS

SLOS336C DECEMBER 2000 REVISED OCTOBER 2002

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

AVAILABLE OPTIONS

PACKAGED DEVICES

MicroStar-Junior (BGA)

(GQS)

SMALL OUTLINE

(D)

MSOP

(DGN)

Device

TPA751GQS

TPA751D

TPA751DGN

Package symbolization

TPA751

ATC

In the SOIC package, the maximum RMS output power is thermally limited to 350 mW; 700 mW peaks can be driven, as long

as the RMS value is less than 350 mW.

The D, DGN, and GQS packages are available taped and reeled. To order a taped and reeled part, add the suffix R to the

part number (e.g., TPA751DR).

Terminal Functions

TERMINAL

NAME

NO.

I/O

DESCRIPTION

NAME

GQS

D, DGN

I/O

DESCRIPTION

BYPASS

BYPASS is the tap to the voltage divider for internal mid-supply bias. This terminal should be
connected to a 0.1-

F to 2.2-

F capacitor when used as an audio amplifier.

GND

GND is the ground connection.

IN is the inverting input. IN is typically used as the audio input terminal.

IN+

IN + is the noninverting input. IN + is typically tied to the BYPASS terminal for SE input.

SHUTDOWN

SHUTDOWN places the entire device in shutdown mode when held low (IDD = 1.5

nA).

VDD

VDD is the supply voltage terminal.

VO+

VO+ is the positive BTL output.

VO is the negative BTL output.

§ A1, A3, A5, B1B5, C1C5, D1D5 are electrical and thermal connections to the ground plane.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, V

6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, V

0.3 V to V

+0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation

Internally limited (see Dissipation Rating Table)

. . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

C to 85

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating junction temperature range, T

C to 150

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

C to 150

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

260

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

¶ Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

DISSIPATION RATING TABLE

PACKAGE

TA = 25

DERATING FACTOR

TA = 70

TA = 85

GQS||

1.66 W||

13.3 mW/

1.06 W

866 mW

725 mW

5.8 mW/

464 mW

377 mW

DGN

2.14 W#

17.1 mW/

1.37 W

1.11 W

# See the Texas Instruments document, PowerPAD Thermally Enhanced Package Application Report

(SLMA002), for more information on the PowerPAD package. The thermal data was measured on a PCB
layout based on the information in the section entitled Texas Instruments Recommended Board for PowerPAD
on page 33 of that document.

|| See the Texas Instruments document, MicroStar Junior

Made Easy Application Brief (SSYA009A) for board

layout information on the MicroStar Junior package.

TPA751

700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

WITH DIFFERENTIAL INPUTS

SLOS336C DECEMBER 2000 REVISED OCTOBER 2002

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

recommended operating conditions

MIN

MAX

UNIT

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Supply voltage, VDD

ÁÁÁ

2.5

ÁÁÁÁ

5.5

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

High-level input voltage, VIH, (SHUTDOWN)

ÁÁÁ

0.9VDD

ÁÁÁÁ

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Low-level input voltage, VIL, (SHUTDOWN)

ÁÁÁ

ÁÁÁÁ

0.1VDD

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Operating free-air temperature, TA

ÁÁÁ

ÁÁÁÁ

ÁÁÁ

electrical characteristics at specified free-air temperature, V

= 3.3 V, T

= 25

C (unless otherwise

noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁÁ

|VOS|

ÁÁÁÁÁÁÁÁÁÁÁÁ

Output offset voltage (measured differentially)

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN = VDD, RL = 8

, RF = 10 k

ÁÁ

ÁÁÁ

ÁÁÁÁ

PSRR

ÁÁÁÁÁÁÁÁÁÁÁÁ

Power supply rejection ratio

ÁÁÁÁÁÁÁÁÁÁÁÁ

VDD = 3.2 V to 3.4 V

ÁÁ

ÁÁÁ

ÁÁÁÁ

IDD

ÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN = VDD, RF = 10 k

ÁÁ

ÁÁÁ

1.25

ÁÁÁ

2.5

ÁÁÁ

ÁÁÁÁ

IDD(SD)

ÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current, shutdown mode (see Figure 4)

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN = 0 V, RF = 10 k

ÁÁ

ÁÁÁ

1.5

ÁÁÁ

1000

ÁÁÁ

ÁÁÁÁ

|IIH|

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN, VDD = 3.3 V, Vi = VDD

ÁÁ

ÁÁÁ

ÁÁÁÁ

|IIL|

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN, VDD = 3.3 V, Vi = 0 V

ÁÁ

ÁÁÁ

operating characteristics, V

= 3.3 V, T

= 25

C, R

= 8

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Output power, See Note 1

ÁÁÁÁÁ

THD = 0.2%,

ÁÁÁÁÁÁ

See Figure 9

ÁÁÁÁÁ

ÁÁÁ

250

ÁÁÁ

ÁÁÁÁ

THD + N

ÁÁÁÁÁÁÁÁÁ

Total harmonic distortion plus noise

ÁÁÁÁÁ

PO = 250 mW,

ÁÁÁÁÁÁ

f = 200 Hz to 4 kHz,

ÁÁÁÁÁ

See Figure 7

ÁÁÁ

0.55%

ÁÁÁ

ÁÁÁÁ

BOM

ÁÁÁÁÁÁÁÁÁ

Maximum output power bandwidth

ÁÁÁÁÁ

AV = 2 V/V,

ÁÁÁÁÁÁ

THD = 2%,

ÁÁÁÁÁ

See Figure 7

ÁÁÁ

kHz

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Unity-gain bandwidth

ÁÁÁÁÁ

Open loop,

ÁÁÁÁÁÁ

See Figure 15

ÁÁÁÁÁ

ÁÁÁ

1.4

ÁÁÁ

MHz

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Supply ripple rejection ratio

ÁÁÁÁÁ

f = 1 kHz,

ÁÁÁÁÁÁ

CB = 1

ÁÁÁÁÁ

See Figure 2

ÁÁÁ

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Noise output voltage

ÁÁÁÁÁ

AV = 1V/V,

ÁÁÁÁÁÁ

CB = 0.1

ÁÁÁÁÁ

See Figure 19

ÁÁÁ

V(rms)

NOTE 1: Output power is measured at the output terminals of the device at f = 1 kHz.

electrical characteristics at specified free-air temperature, V

= 5 V, T

= 25

C (unless otherwise

noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁÁ

|VOS|

ÁÁÁÁÁÁÁÁÁÁÁÁ

Output offset voltage (measured differentially)

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN = VDD, RL = 8

, RF = 10 k

ÁÁ

ÁÁÁ

ÁÁÁÁ

PSRR

ÁÁÁÁÁÁÁÁÁÁÁÁ

Power supply rejection ratio

ÁÁÁÁÁÁÁÁÁÁÁÁ

VDD = 4.9 V to 5.1 V

ÁÁ

ÁÁÁ

ÁÁÁÁ

IDD

ÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN = VDD, RF = 10 k

ÁÁ

ÁÁÁ

1.45

ÁÁÁ

2.5

ÁÁÁ

ÁÁÁÁ

IDD(SD)

ÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current, shutdown mode (see Figure 4)

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN = 0 V, RF = 10 k

ÁÁ

ÁÁÁ

1500

ÁÁÁ

ÁÁÁÁ

|IIH|

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN, VDD = 5.5 V, Vi = VDD

ÁÁ

ÁÁÁ

ÁÁÁÁ

|IIL|

ÁÁÁÁÁÁÁÁÁÁÁÁ

SHUTDOWN, VDD = 5.5 V, Vi = 0 V

ÁÁ

ÁÁÁ

operating characteristics, V

= 5 V, T

= 25

C, R

= 8

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

Output power

ÁÁÁÁ

THD = 0.5%,

ÁÁÁÁÁÁÁ

See Figure 13

ÁÁÁÁ

ÁÁÁ

700

ÁÁÁ

ÁÁÁÁ

THD + N

ÁÁÁÁÁÁÁÁÁÁ

Total harmonic distortion plus noise

ÁÁÁÁ

PO = 250 mW,

ÁÁÁÁÁÁÁ

f = 200 Hz to 4 kHz,

ÁÁÁÁ

See Figure 11

ÁÁÁ

0.5%

ÁÁÁ

ÁÁÁÁ

BOM

ÁÁÁÁÁÁÁÁÁÁ

Maximum output power bandwidth

ÁÁÁÁ

AV = 2 V/V,

ÁÁÁÁÁÁÁ

THD = 2%,

ÁÁÁÁ

See Figure 11

ÁÁÁ

kHz

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

Unity-gain bandwidth

ÁÁÁÁ

Open loop,

ÁÁÁÁÁÁÁ

See Figure 16

ÁÁÁÁ

ÁÁÁ

1.4

ÁÁÁ

MHz

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

Supply ripple rejection ratio

ÁÁÁÁ

f = 1 kHz,

ÁÁÁÁÁÁÁ

CB = 1

ÁÁÁÁ

See Figure 2

ÁÁÁ

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

Noise output voltage

ÁÁÁÁ

AV = 1 V/V,

ÁÁÁÁÁÁÁ

CB = 0.1

ÁÁÁÁ

See Figure 20

ÁÁÁ

V(rms)

The GQS and DGN packages, properly mounted, can conduct 700 mW RMS power continuously. The D package, can only conduct 350 mW

RMS power continuously, with peaks to 700 mW.

Part Number TPA751

Document Outline